Process and apparatus for condensing zinc vapor



Nov. 24, 1925. 1,562,473

0. RAVNER PROCESS AND APPARATUS FOR CONDENSING ZINC VAPOR Filed March 7. 1921 Flgl Invent bn b ste V Y wift fifleya UNITED STATES PATENT" OFFICE.

SELSKAB non EVLEK'VTROK nnss ENTITY.

EMISK. INDUSTRI, CHRISTIANIA,

rnocnss AND APPARATUS FOR connnnsme 'zINo VAPOR.

Application filed March 7, 1921.

To all wlz om it may concern:

Be it known that I, OYSTEIN RAVNER, a sub ect of the King of Norway, and a resident of Christiania,

Kingdom of Norway,

have invented certain new and useful Improvements 1n Processes and Apparatus for Condensing Zinc lowing is a specifica A This invention relates to the condensing of Vapor, of which the foltion.

zinc vapors, and the ob ect of the invention 1s a process, whereby condensation of such vapors is eff ected without any considerable formation of the so-called zinc dust or powder.

According to my ploy a condensatio first a movable part part. The movable connected with the zinc furnace, and revolving drum, w large diameter, tl for the gases and particles which h portunity of settl comparatively lar to a marked exte necessary I may by blowing air a 1113" water cooling. size of the drum as compared with the furnace it should be necessary to heat the drum, an electric arc may this purpose Where maintain the tern I elevation.

drum, they thereof 11 system consisting of present invention I emand second a stationary part is generally directly upper part of an electric preferably consists of a hich has a. comparatively ius affording a lowspeed giving the liquid and solid ave separated out an oping. The drum having a ge diameter will be cooled nt during rotation, but if provide' additional cooling gainst the drum or supply- If on account of the be arranged therein for by it will be possible to perature When the furnace strike the because of their at the desired gases enter the comparatively cool top buoyancy and are thus subjected to almost instantaneous cooling to about 700 C I continued by reason of the rotation of the drum. Further the This cooling effect is rotation of the drum causes a rapid and intimate mixing of the comparatively large is "present in the dr condition and the amounts of hot gases entering from the furnace, whereby the cooling of the latter is greatly accelerated. the drum its walls will continuously be freed from possibly sintered dust .on account of the friction drum,

the

against quantity of gas which um in arelatively cool comparatively small During the rotation of the powder present in Serial No. 450,121.

of liquid zinc, which collects at the bottom of the drum together with the zinc dust. On account of the rotation of the drum. the zinc dust is readily reduced to liquid zinc especially if rollers are placed in the drum.

The non-condensable gases pass through the drum into the stationary part of the condensing system, consisting of an inclined tube in which the remainder of the zinc vapor is condensed. The condensed product on account of the angle of the tube will antomatically fall back into be subjected to the same mechanical'treatmentas the previously condensed product. The gases which have been completely freed from zinc vapors are led out through an opening in the inclined tube.

3y employing acondensation system as described above I obtain considerable advantage; Because the gases in the revolvin drum are rapidly cooled down to 700 C. or lower, the. formation of dust is reduced without causing the walls to become covered with a poorlyv heat conductive layer of dust, as is the case in the usual stationary condensation channels.

Furthermore the use of a stationary inclined tube directly connected with the drum means a great advantage in making it possible to have a comparatively small drum, as the final condensation will take place in the stationary part, and the condensate will fall back into the drum. and'will be treated there 1e same way as the condensate originally formed therein.

s is apparent from the above remarks the drum serves two purposes, first the cooling of the furnace gases and second the subsequent mechanical treatment of the zinc dust which has separated out in the drum the drum, and thus on the other with an inclined stationary tube.

the non-condensable gases may escape.

. provided during a comparatively short period for subjecting the dust to mechanical movement. After each such stirring the liquid zinc may be removed by tapping in known manner after stopping the drum.

Instead of removing the zinc dust in the usual manner I have found that this may advantageously be done through an opening in the wall of the drum'during its rotation. To avoid admission of air during this operation it is preferable to enclose the opening with a dust box or other dust collector. This may suitably be so constructed and arranged that the dust will fall into the box in the lowest position thereof and cannot fall back into the drum during rotation.

I have illustrated my invention in the drawing forming part of this application.

Fig. 1 shows a section through a zinc furnace with adjoining condenser, and Fig. 2 shows a section through the revolving drum taken at the line IIII of Fig. 1.

A revolving drum 6 is directly and rotatably connected with an electric zinc furnace 5 of ordinary type on the one side and 7 provided with an opening 8 through which The revolving drum is supported on the rollers 9 and gets its rotating movement by means' of the gear 10. The wall of the drum is with an opening 11, which is generally closed with a stopper. When the zinc dust is to be removed from the drum, the dust box 12 is placed outside the opening 11. The dust box carries a tube 13, which when the box is in place forms a direct continuation of the opening 11. Through this tube the zinc dust falls into the box 12 when this is in its lowest position. During the upward movement of the box the zinc dust falls into one side thereof. and is thus prevented from falling back into the drum. The box is provided with an opening having a cover 14 through which the zinc dust may be emptied.

The above specific' illustration of my invention has been given for clearness of understanding only, and shall mean no limitation of my invention, but the appended claims should be construed as broadly as permissible in view of the prior art.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A condenser for zinc vapors comprising a revolving drum and a stationary tube connected with the drum in such manner that the condensate formed in the tube will automatically fall back into the drum.

2. A condenser for zinc vapors comprising a revolving drum directly connected with a zincfurnace and a stationary tube connected with said drum in such manner that the condensate formed in the tube will automatically fall back into the drum.

3. A condenser for zinc vapors comprising a revolving drum directly connected with a zinc furnace and a stationary tube connected with said drum in such manner that the condensate formed in the tube will automatically fall back into'the drum, said drum having an opening in its wall and means enabling removal of dust therethrough during the rotation of the drum.

4:- A condenser for zinc vapors comprising a revolving drum directly connected with a zinc furnace and a stationary tube connected condenser comprising a revolving drum and a stationary tube connected therewith and causing the drum to rotate first at a com paratively low speed, and then increasing the speed for a comparatively short time, thus subjecting the Zinc dust formed to a strong mechanical treatment.

Signed at Christiania, Norway, day of February, 1921;

this 16 oYs'r IN RAVNER. 

